Exhibit 21 Central And South West Corporation Subsidiaries Of The Registrant As Of December 31, 1995 Company Name Business Conducted Under Same Name State or Jurisdiction of Incorporation Central Power and Light Company Texas 539 North Carancahua Street Corpus Christi, Texas 78401-2802 Public Service Company of Oklahoma Oklahoma 212 East 6th Street Tulsa, Oklahoma 74119-1212 Southwestern Electric Power Company Delaware 428 Travis Street Shreveport, Louisiana 71156-0001 West Texas Utilities Company Texas 301 Cypress Street Abilene, Texas 79601-5820 SEEBOARD, plc United Kingdom Registered Office Forest Gate, Brighton Road Crawley, West Sussex RH11 9BH Transok, Inc. Oklahoma 110 West 7th Street Tulsa, Oklahoma 74119-1044 Central and South West Services, Inc. Texas 2 West Second Street Tulsa, Oklahoma 74103-3102 and 1616 Woodall Rodgers Freeway Dallas, Texas 75202-1234 CSW Communications, Inc. Delaware 1705 South Capital of Texas Highway Suite 400 Austin, Texas 78746 CSW Credit, Inc. Delaware 1616 Woodall Rodgers Freeway Dallas, Texas 75202-1234 CSW Energy, Inc. Texas 1616 Woodall Rodgers Freeway Dallas, Texas 75202-1234 CSW International, Inc. Delaware 1616 Woodall Rodgers Freeway Dallas, Texas 75202-1234 CSW Leasing, Inc. Delaware 1616 Woodall Rodgers Freeway Dallas, Texas 75202-1234 EnerShop Inc. Delaware 1616 Woodall Rodgers Freeway Dallas, Texas 75202-1234